Hey there, Daya! Welcome to planDisney! 
Thanks for sharing your delicious dining question with us. I consider myself a bit of an expert in the fried preparations of chicken and uniquely qualified to answer this question. So let’s dig in! 
There are not currently Mickey-shaped chicken nuggets available at Walt Disney World, and from what I can tell, most dining locations are currently offering chicken strips and not nuggets. I did find that 
Pinocchio Village Haus at the Magic Kingdom has kids' allergy-friendly chicken breast nuggets. Menus are subject to change, and you can always speak to a Cast Member at any dining location to see if they might have off-menu chicken nuggets. It never hurts to ask! 
If you’re interested in other forms of chicken—namely chicken strips/tenders—then I’ve got some exciting news for you. 
The Disney Parks Blog recently shared that 
13 new flavors of chicken strips are available at Walt Disney World. I took it upon myself to do a taste test on my most recent trip, but was only able to try 8 of the 13. I can’t share my official rankings until I’ve tried them all, but the Jerk BBQ Chicken Strips with Pineapple Salsa (available from 
The Mara at Animal Kingdom Lodge, as well as a few other resorts) are my current favorite. 
Daya, I hope this information helps with your vacation planning and that you have a wonderfully scrumptious Walt Disney World vacation. Don’t hesitate to come back to planDisney if you have any other questions or need additional dining recommendations. We’re always happy both help! 
Bon appetit and magical travels! 
Matt